{"version":"2.1.179","anchor":"precompute-compaction-setting-gradual-rollout","canonical_anchor":"precompute-compaction-setting-gradual-rollout","heading":"Precompute Compaction Setting [Gradual Rollout]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.179\/e\/precompute-compaction-setting-gradual-rollout","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.179","markdown":"### Precompute Compaction Setting [Gradual Rollout]\n\n**What**\n\nA new experimental setting `precomputeCompactionEnabled` allows Claude to precompute the compaction summary in the background before it's actually needed, making context-window compaction faster when it triggers.\n\n**Status**\n\nSetting infrastructure exists and is wired to the settings UI, but the setting toggle is only shown when the server flag `tengu_sepia_moth` is enabled. The actual precompute behavior also requires this flag. The setting description reads: \"@internal Precompute the compaction summary in the background before it is needed. Only applies when auto-compact is on.\"\n\n**Details**\n\n- Appears in the Experimental section of `\/settings` when enabled\n- Default value is `true` when the flag is active\n- Emits a `tengu_precompute_compaction_setting_changed` telemetry event on change\n\n**Evidence**\n\nSetting description (search for `\"Precompute the compaction summary in the background\"`) and setting key (search for `\"precomputeCompactionEnabled\"`)\n\n- Flag `tengu_sepia_moth`: Off in both readings (read for one account on one subscription tier against v2.1.179; this account: off, anonymous baseline: off, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release."}